Air-Independent Propulsion (AIP) is a technology used in submarines that allows them to operate underwater without needing to surface for air. This capability enhances stealth and extends the duration of underwater missions, making submarines more effective in naval operations. AIP systems can utilize various methods, including fuel cells, batteries, or Stirling engines, to generate power while submerged. AIP technology is particularly important for naval forces that require stealth and endurance in their underwater fleets. By reducing the need for snorkel operations, AIP-equipped submarines can remain hidden from detection, improving their tactical advantages in various maritime scenarios.